[The serological behaviour of the pyogenic anaerobes, Peptococcus asaccharolyticus and P. prevotii (author's transl)].

Using rabbit antisera against whole-cell adjuvant-free antigens, the serological behaviour of ten butyrate-producing Peptococcus strains, five belonging to P. asaccharolyticus and five to P. prevotii, was studied in cross-agglutination and gel-diffusion experiments. Agglutination occurred in all the homologous and nearly one third of the heterologous antigen-antibody systems. Cross-reactions, however, were clearly restricted to members of the same Peptococcus species.